fs/gfs2/ops_super.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/sched.h>
  11 #include <linux/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/completion.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/statfs.h>
  16 #include <linux/seq_file.h>
  17 #include <linux/mount.h>
  18 #include <linux/kthread.h>
  19 #include <linux/delay.h>
  20 #include <linux/gfs2_ondisk.h>
  21 #include <linux/crc32.h>
  22 #include <linux/lm_interface.h>
  23
  24 #include "gfs2.h"
  25 #include "incore.h"
  26 #include "glock.h"
  27 #include "inode.h"
  28 #include "lm.h"
  29 #include "log.h"
  30 #include "mount.h"
  31 #include "ops_super.h"
  32 #include "quota.h"
  33 #include "recovery.h"
  34 #include "rgrp.h"
  35 #include "super.h"
  36 #include "sys.h"
  37 #include "util.h"
  38 #include "trans.h"
  39 #include "dir.h"
  40 #include "eattr.h"
  41 #include "bmap.h"
  42
  43 /**
  44  * gfs2_write_inode - Make sure the inode is stable on the disk
  45  * @inode: The inode
  46  * @sync: synchronous write flag
  47  *
  48  * Returns: errno
  49  */
  50
  51 static int gfs2_write_inode(struct inode *inode, int sync)
  52 {
  53         struct gfs2_inode *ip = GFS2_I(inode);
  54
  55         /* Check this is a "normal" inode */
  56         if (inode->i_private) {
  57                 if (current->flags & PF_MEMALLOC)
  58                         return 0;
  59                 if (sync)
  60                         gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
  61         }
  62
  63         return 0;
  64 }
  65
  66 /**
  67  * gfs2_put_super - Unmount the filesystem
  68  * @sb: The VFS superblock
  69  *
  70  */
  71
  72 static void gfs2_put_super(struct super_block *sb)
  73 {
  74         struct gfs2_sbd *sdp = sb->s_fs_info;
  75         int error;
  76
  77         if (!sdp)
  78                 return;
  79
  80         if (!strncmp(sb->s_type->name, "gfs2meta", 8))
  81                 return; /* Nothing to do */
  82
  83         /*  Unfreeze the filesystem, if we need to  */
  84
  85         mutex_lock(&sdp->sd_freeze_lock);
  86         if (sdp->sd_freeze_count)
  87                 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
  88         mutex_unlock(&sdp->sd_freeze_lock);
  89
  90         kthread_stop(sdp->sd_quotad_process);
  91         kthread_stop(sdp->sd_logd_process);
  92         kthread_stop(sdp->sd_recoverd_process);
  93         while (sdp->sd_glockd_num--)
  94                 kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);
  95         kthread_stop(sdp->sd_scand_process);
  96
  97         if (!(sb->s_flags & MS_RDONLY)) {
  98                 error = gfs2_make_fs_ro(sdp);
  99                 if (error)
 100                         gfs2_io_error(sdp);
 101         }
 102         /*  At this point, we're through modifying the disk  */
 103
 104         /*  Release stuff  */
 105
 106         iput(sdp->sd_master_dir);
 107         iput(sdp->sd_jindex);
 108         iput(sdp->sd_inum_inode);
 109         iput(sdp->sd_statfs_inode);
 110         iput(sdp->sd_rindex);
 111         iput(sdp->sd_quota_inode);
 112
 113         gfs2_glock_put(sdp->sd_rename_gl);
 114         gfs2_glock_put(sdp->sd_trans_gl);
 115
 116         if (!sdp->sd_args.ar_spectator) {
 117                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 118                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 119                 gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
 120                 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 121                 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 122                 iput(sdp->sd_ir_inode);
 123                 iput(sdp->sd_sc_inode);
 124                 iput(sdp->sd_qc_inode);
 125         }
 126
 127         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 128         gfs2_clear_rgrpd(sdp);
 129         gfs2_jindex_free(sdp);
 130         /*  Take apart glock structures and buffer lists  */
 131         gfs2_gl_hash_clear(sdp, WAIT);
 132         /*  Unmount the locking protocol  */
 133         gfs2_lm_unmount(sdp);
 134
 135         /*  At this point, we're through participating in the lockspace  */
 136         gfs2_sys_fs_del(sdp);
 137         kfree(sdp);
 138 }
 139
 140 /**
 141  * gfs2_write_super
 142  * @sb: the superblock
 143  *
 144  */
 145
 146 static void gfs2_write_super(struct super_block *sb)
 147 {
 148         sb->s_dirt = 0;
 149 }
 150
 151 /**
 152  * gfs2_sync_fs - sync the filesystem
 153  * @sb: the superblock
 154  *
 155  * Flushes the log to disk.
 156  */
 157 static int gfs2_sync_fs(struct super_block *sb, int wait)
 158 {
 159         sb->s_dirt = 0;
 160         if (wait)
 161                 gfs2_log_flush(sb->s_fs_info, NULL);
 162         return 0;
 163 }
 164
 165 /**
 166  * gfs2_write_super_lockfs - prevent further writes to the filesystem
 167  * @sb: the VFS structure for the filesystem
 168  *
 169  */
 170
 171 static void gfs2_write_super_lockfs(struct super_block *sb)
 172 {
 173         struct gfs2_sbd *sdp = sb->s_fs_info;
 174         int error;
 175
 176         for (;;) {
 177                 error = gfs2_freeze_fs(sdp);
 178                 if (!error)
 179                         break;
 180
 181                 switch (error) {
 182                 case -EBUSY:
 183                         fs_err(sdp, "waiting for recovery before freeze\n");
 184                         break;
 185
 186                 default:
 187                         fs_err(sdp, "error freezing FS: %d\n", error);
 188                         break;
 189                 }
 190
 191                 fs_err(sdp, "retrying...\n");
 192                 msleep(1000);
 193         }
 194 }
 195
 196 /**
 197  * gfs2_unlockfs - reallow writes to the filesystem
 198  * @sb: the VFS structure for the filesystem
 199  *
 200  */
 201
 202 static void gfs2_unlockfs(struct super_block *sb)
 203 {
 204         gfs2_unfreeze_fs(sb->s_fs_info);
 205 }
 206
 207 /**
 208  * gfs2_statfs - Gather and return stats about the filesystem
 209  * @sb: The superblock
 210  * @statfsbuf: The buffer
 211  *
 212  * Returns: 0 on success or error code
 213  */
 214
 215 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
 216 {
 217         struct super_block *sb = dentry->d_inode->i_sb;
 218         struct gfs2_sbd *sdp = sb->s_fs_info;
 219         struct gfs2_statfs_change_host sc;
 220         int error;
 221
 222         if (gfs2_tune_get(sdp, gt_statfs_slow))
 223                 error = gfs2_statfs_slow(sdp, &sc);
 224         else
 225                 error = gfs2_statfs_i(sdp, &sc);
 226
 227         if (error)
 228                 return error;
 229
 230         buf->f_type = GFS2_MAGIC;
 231         buf->f_bsize = sdp->sd_sb.sb_bsize;
 232         buf->f_blocks = sc.sc_total;
 233         buf->f_bfree = sc.sc_free;
 234         buf->f_bavail = sc.sc_free;
 235         buf->f_files = sc.sc_dinodes + sc.sc_free;
 236         buf->f_ffree = sc.sc_free;
 237         buf->f_namelen = GFS2_FNAMESIZE;
 238
 239         return 0;
 240 }
 241
 242 /**
 243  * gfs2_remount_fs - called when the FS is remounted
 244  * @sb:  the filesystem
 245  * @flags:  the remount flags
 246  * @data:  extra data passed in (not used right now)
 247  *
 248  * Returns: errno
 249  */
 250
 251 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
 252 {
 253         struct gfs2_sbd *sdp = sb->s_fs_info;
 254         int error;
 255
 256         error = gfs2_mount_args(sdp, data, 1);
 257         if (error)
 258                 return error;
 259
 260         if (sdp->sd_args.ar_spectator)
 261                 *flags |= MS_RDONLY;
 262         else {
 263                 if (*flags & MS_RDONLY) {
 264                         if (!(sb->s_flags & MS_RDONLY))
 265                                 error = gfs2_make_fs_ro(sdp);
 266                 } else if (!(*flags & MS_RDONLY) &&
 267                            (sb->s_flags & MS_RDONLY)) {
 268                         error = gfs2_make_fs_rw(sdp);
 269                 }
 270         }
 271
 272         if (*flags & (MS_NOATIME | MS_NODIRATIME))
 273                 set_bit(SDF_NOATIME, &sdp->sd_flags);
 274         else
 275                 clear_bit(SDF_NOATIME, &sdp->sd_flags);
 276
 277         /* Don't let the VFS update atimes.  GFS2 handles this itself. */
 278         *flags |= MS_NOATIME | MS_NODIRATIME;
 279
 280         return error;
 281 }
 282
 283 /**
 284  * gfs2_clear_inode - Deallocate an inode when VFS is done with it
 285  * @inode: The VFS inode
 286  *
 287  */
 288
 289 static void gfs2_clear_inode(struct inode *inode)
 290 {
 291         /* This tells us its a "real" inode and not one which only
 292          * serves to contain an address space (see rgrp.c, meta_io.c)
 293          * which therefore doesn't have its own glocks.
 294          */
 295         if (inode->i_private) {
 296                 struct gfs2_inode *ip = GFS2_I(inode);
 297                 ip->i_gl->gl_object = NULL;
 298                 gfs2_glock_schedule_for_reclaim(ip->i_gl);
 299                 gfs2_glock_put(ip->i_gl);
 300                 ip->i_gl = NULL;
 301                 if (ip->i_iopen_gh.gh_gl)
 302                         gfs2_glock_dq_uninit(&ip->i_iopen_gh);
 303         }
 304 }
 305
 306 /**
 307  * gfs2_show_options - Show mount options for /proc/mounts
 308  * @s: seq_file structure
 309  * @mnt: vfsmount
 310  *
 311  * Returns: 0 on success or error code
 312  */
 313
 314 static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
 315 {
 316         struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
 317         struct gfs2_args *args = &sdp->sd_args;
 318
 319         if (args->ar_lockproto[0])
 320                 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
 321         if (args->ar_locktable[0])
 322                 seq_printf(s, ",locktable=%s", args->ar_locktable);
 323         if (args->ar_hostdata[0])
 324                 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
 325         if (args->ar_spectator)
 326                 seq_printf(s, ",spectator");
 327         if (args->ar_ignore_local_fs)
 328                 seq_printf(s, ",ignore_local_fs");
 329         if (args->ar_localflocks)
 330                 seq_printf(s, ",localflocks");
 331         if (args->ar_localcaching)
 332                 seq_printf(s, ",localcaching");
 333         if (args->ar_debug)
 334                 seq_printf(s, ",debug");
 335         if (args->ar_upgrade)
 336                 seq_printf(s, ",upgrade");
 337         if (args->ar_num_glockd != GFS2_GLOCKD_DEFAULT)
 338                 seq_printf(s, ",num_glockd=%u", args->ar_num_glockd);
 339         if (args->ar_posix_acl)
 340                 seq_printf(s, ",acl");
 341         if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
 342                 char *state;
 343                 switch (args->ar_quota) {
 344                 case GFS2_QUOTA_OFF:
 345                         state = "off";
 346                         break;
 347                 case GFS2_QUOTA_ACCOUNT:
 348                         state = "account";
 349                         break;
 350                 case GFS2_QUOTA_ON:
 351                         state = "on";
 352                         break;
 353                 default:
 354                         state = "unknown";
 355                         break;
 356                 }
 357                 seq_printf(s, ",quota=%s", state);
 358         }
 359         if (args->ar_suiddir)
 360                 seq_printf(s, ",suiddir");
 361         if (args->ar_data != GFS2_DATA_DEFAULT) {
 362                 char *state;
 363                 switch (args->ar_data) {
 364                 case GFS2_DATA_WRITEBACK:
 365                         state = "writeback";
 366                         break;
 367                 case GFS2_DATA_ORDERED:
 368                         state = "ordered";
 369                         break;
 370                 default:
 371                         state = "unknown";
 372                         break;
 373                 }
 374                 seq_printf(s, ",data=%s", state);
 375         }
 376
 377         return 0;
 378 }
 379
 380 /*
 381  * We have to (at the moment) hold the inodes main lock to cover
 382  * the gap between unlocking the shared lock on the iopen lock and
 383  * taking the exclusive lock. I'd rather do a shared -> exclusive
 384  * conversion on the iopen lock, but we can change that later. This
 385  * is safe, just less efficient.
 386  */
 387 static void gfs2_delete_inode(struct inode *inode)
 388 {
 389         struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
 390         struct gfs2_inode *ip = GFS2_I(inode);
 391         struct gfs2_holder gh;
 392         int error;
 393
 394         if (!inode->i_private)
 395                 goto out;
 396
 397         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB, &gh);
 398         if (unlikely(error)) {
 399                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
 400                 goto out;
 401         }
 402
 403         gfs2_glock_dq(&ip->i_iopen_gh);
 404         gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
 405         error = gfs2_glock_nq(&ip->i_iopen_gh);
 406         if (error)
 407                 goto out_uninit;
 408
 409         if (S_ISDIR(inode->i_mode) &&
 410             (ip->i_di.di_flags & GFS2_DIF_EXHASH)) {
 411                 error = gfs2_dir_exhash_dealloc(ip);
 412                 if (error)
 413                         goto out_unlock;
 414         }
 415
 416         if (ip->i_di.di_eattr) {
 417                 error = gfs2_ea_dealloc(ip);
 418                 if (error)
 419                         goto out_unlock;
 420         }
 421
 422         if (!gfs2_is_stuffed(ip)) {
 423                 error = gfs2_file_dealloc(ip);
 424                 if (error)
 425                         goto out_unlock;
 426         }
 427
 428         error = gfs2_dinode_dealloc(ip);
 429
 430 out_unlock:
 431         gfs2_glock_dq(&ip->i_iopen_gh);
 432 out_uninit:
 433         gfs2_holder_uninit(&ip->i_iopen_gh);
 434         gfs2_glock_dq_uninit(&gh);
 435         if (error)
 436                 fs_warn(sdp, "gfs2_delete_inode: %d\n", error);
 437 out:
 438         truncate_inode_pages(&inode->i_data, 0);
 439         clear_inode(inode);
 440 }
 441
 442
 443
 444 static struct inode *gfs2_alloc_inode(struct super_block *sb)
 445 {
 446         struct gfs2_sbd *sdp = sb->s_fs_info;
 447         struct gfs2_inode *ip;
 448
 449         ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
 450         if (ip) {
 451                 ip->i_flags = 0;
 452                 ip->i_gl = NULL;
 453                 ip->i_greedy = gfs2_tune_get(sdp, gt_greedy_default);
 454                 ip->i_last_pfault = jiffies;
 455         }
 456         return &ip->i_inode;
 457 }
 458
 459 static void gfs2_destroy_inode(struct inode *inode)
 460 {
 461         kmem_cache_free(gfs2_inode_cachep, inode);
 462 }
 463
 464 struct super_operations gfs2_super_ops = {
 465         .alloc_inode            = gfs2_alloc_inode,
 466         .destroy_inode          = gfs2_destroy_inode,
 467         .write_inode            = gfs2_write_inode,
 468         .delete_inode           = gfs2_delete_inode,
 469         .put_super              = gfs2_put_super,
 470         .write_super            = gfs2_write_super,
 471         .sync_fs                = gfs2_sync_fs,
 472         .write_super_lockfs     = gfs2_write_super_lockfs,
 473         .unlockfs               = gfs2_unlockfs,
 474         .statfs                 = gfs2_statfs,
 475         .remount_fs             = gfs2_remount_fs,
 476         .clear_inode            = gfs2_clear_inode,
 477         .show_options           = gfs2_show_options,
 478 };
 479